White dotted mucous membrane on the inner side of the lips may be caused by mucous membrane leukoplakia, lichen planus or white edema. 1. Mucosal leukoplakia: a white patch with a rough, slightly hard surface that cannot be scraped off and uncovered. It is often caused by local stimuli such as tobacco, alcohol, and bad restorations. 2. lichen planus: it is a chronic inflammatory disease caused by immune factors, mental factors, endocrine factors, etc. The lesions are irregular white linear patterns, often with congestion, vesicles, sometimes accompanied by skin lesions. 3. White edema: may be related to smoking, chewing betel nut, the specific etiology is not clear, for gray-white or milky-white translucent patchy membrane, soft, no pressure pain, sometimes can appear folds. White dotted mucous membrane on the inner side of the lips may have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor for targeted treatment or treatment.